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H. ENDERS. I DIGIT WHEEL FOR CALCULATING MACHINES. APPLICATION FILED DEC.I8, 1920- RENEWED MAR. 25. 1922 1,414,730. Patented May 2, 1 922.

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HUGQ BINDER- .3, I I TIGN, 01? NEW YORK, N. 'Y.,

or sntnnvimin, new Jansen, Assmn'oa TO THE LEHIGI-I convene a. ccitroaA'rIoN or DELAWARE.

DIGITWHEEL FOR CALCULATING MACHINES.

1 Specification of Letters Patent.

. Patented May 2, 1922.

Application filed December 18, 1920, Serial No. 431,751. Renewed March 25, 1922. Serial No. 546,891.

T all whom it may concern:

I Be it known that I, HUGO ENDEns, a citizen of the Republic of Germany, residing-at Belleville, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Digit Wheels for Calculating Machines, of which the following is a specification.

This invention relates to calculating machines, and particularly to certain IHIPIOVG;

ments in the details of construction of such a calculating machine as is illustrated in mgr pending application for patent, Serial :tt343,325. filed December 8, 1919, and more L5' specifically to improvements in the means whereby a digit wheel is operatively connected to its associated pinion.

Heretofore in machines of this classit has been common to form the digit wheel of a metallic core, to which the pinion was riveted. It has been found objectionable to do this for the reason that in the course of time the rivets would work loose and project slightly on that .face of the digit ,wheel upon which the transfer lug was mounted or disposed; and as a consequence this rivet would act in place ofthe transfer lug, thus leading to a miscalculation until the rivets were once more driven home and overturned. This is a very frequent source of complaint.

My invention is designed to provide a very simple manner of constructing the digit wheels and connecting them with the corresponding pinions which does not involve the use of'rivets, but in. which the pinion is formed with a central sleeve-like hub disposed through the annular body of the digit wheel, this sleeve-like hub being provided with a plurality of axially disposed prongs insertible through openings in a coactingplate disposed on the other side of the digit wheel and overturned upon v this plate, this plate carrying the usual transfer lu or tooth.

A further ob]ect is to provide a very simple way of forming a tooth or stud within the interior of the digit wheel adapted to engage a like tooth or stud projecting from i the shaft upon which the digitwheels are mounted. I I

An embodiment of my invention is illustrated in the accompanying drawings, wherein I have illustrated a portion only part of'my present invention.

.Figure. 1 is a fragmentary longitudinal sectional view through a calculating machine of a well known type showing in elevation and section two of my improved registerin wheels;

Figure 2 is a section on the line 22 of Figure 1;

Figure 3 is an elevation'of the pinion and its hub;

I Figure 4 isa sectional view on the line l4;'of Figure 3';

Figure 5 is a face view .of' thetransfer lug disk;

Figure 6 is aperspective view of oneend of the wheel carrying shaft and its bearing;

Figure 7 is a face View of the registering disk and its associated transfer lug carrying disk;

Referring to these drawings, 10 designates the shaft upon which the several digit wheels and their corresponding pinions are mounted. All of these digit wheels are of the same character. Therefore, a description of one will apply to all. The shaft is longitudinally movable in suitable bearings and s urged in one direction bya spring 11 but is shiftable in the opposite direction upon a rotation of the shaft by means of. a cam '12 formed on the bearing 13 with which a pin or stud 14 on the shaft engages. This is the common and ordinary manner of shifting the shaft longitudinally upon 'a' rotation of the shaft and forms no part of 'my invention, and any other means for securing a longitudinal movement of the shaftupon a rotation of the shaft may be used. Any suitable-means may be used for rotating the shaft,

as this forms no The shaft is provided at intervals'with outwardly projecting studs or teeth 15, these studs being bevelled upon one face and being radial upon the other face. Each digit wheel is constructed as illustrated in Figures 1 to 5. The digit Wheel is made up of an annulus 16 having upon its peripheral face the figures 0 to 9 and having upon one face a small recess or socket 17. The central aperture of the annulus is larger than the diameter of the shaft 10. Coacting with this annulus or body portion is a gear wheel 18 having a central aperture 19 the size of the shaft 10, this aperture at one point having a radially extending keyway 20.

Concentric to the central aperture and disposed outward thereof the pinion 18 is formed .with a sleeve-like hub .21 which has a width slightly greater'than the width of the annular body 16 and which is formed to provide axially extending lugs 22, there being three of these lugs illustrated, these being disposed e'qui-distantly. Qne of the gear teeth is formed with a projecting pm 23 which projects in the direction of these lugsand which. is adapted to engage in the recess or socket 17 formed in the digit whee-l body when the pinion and the digit wheel body are engaged with each other. Coacting withthesleeVe-likehub and disposed against the opposite face of the annular body 16 from the pinion 18 is an annular disk 24: having a plurality of circumferen- .tially elongated perforations 25 of the same number as and designed to receive the ends of the lugs 22. This member 24: is also formed with akeyway 26 and is also formed -with a radially projecting, oppositely bevelled transfer lug or tooth 27, as is usual in machines of this character. In assembling these parts, the sleeve-like hub of the pinion 18 is passed through the aperture in the body 16 and the pin 23 is 1nserted in the recess 17 and then the member 2 1 is disposed against the body 16, with the lugs 22 extending through the apertures 25. Then the projecting ends of the lugs 22 are upset, overturned, or headed, and thus: the

three elements which form the completed" 18 is set outward of the inner edge of the pinion, an annular flange 28 is left in which the keyway 20 is cut. This annular portion 28' is depressed below the outerface of the pinion, and ata point almost diametrically opposite the keyway this annular flange 1S punched from the outside face to form an inwardly projecting ratchet tooth 29, which ratchet tooth coacts with the tooth 15 on the shaft 10.

It will be understood, of course, by those skilled in the art that normally the shaft 10 merely acts'as a support for the digit wheels which are freely rotatable relative to each other upon said shaft, these wheels, however, being held against accidental rota tion by the inter-meshing of the several pinions 18 with their corresponding transmission gears or pinions, and that the longiin the sight opening in the casing within which the digit wheels are disposed, the operator'rotates the shaft 10 in any suit- .able manner and by a means which is well known. Initially or at the start of this rotating movement of the shaft, the pin 14: riding over the cam surface 12 of the bearing 13, moves the shaft axially so that the teeth or studs 15 on the shaft move into contact with the inner face of the flange 28 and into circumferential alignment with the teeth 29 projecting from these flanges. Therefore, upon the continued rotation of the shaft 10, the tooth 15 will engage the teeth 29 and rotate said wheels. The shaft 10 is simply given one complete rotation. When this rotation has been completed, the pin 14: drops again into the notch of the cam 12 and the shaft,under the action of the spring, shifts to a position to carry the lugs 15 out of alignment with the teeth 29. This is the common and usual operation of these parts and forms no part of my in vention, except, in so far as my construction permits the tooth 29 to be formed with in the digit wheel in a very simple and expeditious manner at the same time that the pinion is formed. l

It..will be understood, of course, that I have merely shown one particular manner of shifting the shaft 10 longitudinally upon a complete rotation of the shaft and that this is purely illustrative and that I may use any means for causing the longitudinal shifting motion of the shaft suflicient to bring the teeth 15 thereof into alignment with the teeth 29 of the digit wheels,

l. A digit wheel and associated pinion for calculating machines comprising an annular digit wheel body, a pinion having a sleevelike hub inserted through the central aperture of the body, the pinion and body being formed for unitary rotation when -in engagement with each other, and a disk upon the opposite face of the body from the pinion with which the sleeve-like hub has operative engagement.-

2. A digit wheel and associated pinion for calculating machines comprising an annular digit wheel body, a. pinion having a sleevelike hub inserted through the central aperture of the body, the pinion and body being formed for unitary rotation when in engagement with each other, and a disk upon the opposite face of the body from the pinion with which the sleeve-like hub has operative engagement, said disk beingformed with a projecting transfer lug.

3. A digit wheel and-associated pinion for calculating machines comprising an annular digit wheel body, a pinion having a sleevelike hub insertible through the aperture of the body, the pinion and body having means to cause unitary rotation of the pinion and body when they are engaged, said sleeve-like hub having axially extending, spaced lugs, and a disk disposed against the opposite face of,the body from said pinion and having nular hub having forming extensions of the hub and spaced apertures the ends of the lugs being overturned upon said disk.

4. A digit wheel and associated pinion for calculating machines comprising an an- .nular digit wheel body having on one face a depression, a pinion having upon onetace a projection engageable in said depression, the pinion being lugs extending axially and equi-distantly, and a disk disposed against theopposite face of the body from ,the pinion through which the lugs project,

formed with a central ans having apertures through which the lugs extend, the ends of the lugs being overturned upon said disk, said disk being formed with a radially projecting transfer lug.

5. A digit wheel and associated pinion for calculating machines comprising an annular digit wheel body, a pinion having an annular hub and operatively engaged with the digit wheel for rotation therewith, the pinion being formed with an inwardly projecting flange pinion, said flange being formed at one point witha keyway and at another point the material'of the flange being depressed to form an axially extending tooth,

6. A pinion for calculating machines having an annular hub,the hub projecting laterally from the pinion and said hub adjacent one face of the pinion being formed with an inwardly projecting, relatively thin'flange, the flange being formed at one point with a keyway and atanother point being pressed inward to form an axially projecting tooth.

In testimony whereof Iaflix my signature.

- HUGO ENDERS.

at the junction of the hub with the 

